Multiple bore pulley assembly



Oct. 27, 1953 R. A. JoELsoN MULTIPLE sons PULLEY ASSEMBLY 2 Sheets-55s 1 Filed Jan. 2:5, 1951 wings IN V EN T 0R. EO/VAL 0 A. JOEL SON A T TOE/V5 Y5.

Oct. 27, 1953 R. A. JOELSN MULTIPLE BORE PULLEY ASSEMBLY 2 Sheets-Sheet 2 Filed Jan. 23, 1951 INVENTOR. 201M440 .4. JOELSO/V ATTOENE Y5 Patented Oct. 27, 1953 as: PA $657,081, MULTIPLE.. BORE. PULLEY" AS SEMBLY Ronald'sA'. ".Ibelson, Ohetek, tWisJ ApplicationJanuary, 23, 1951, SerialNb. 207,366: 7 Glaims. (Cl. 287 -529 'lhis' invention reiates to. drivexdevices; such as beltfpulfeys anwgears; and more particularly to* a; Uelttpullyhaving a lrub providingselectivel'y usable; shaft bores'- of different sizes:

Itlf is? among the" chi eets of the invention to providea'drivedevice; such as a belt pulley; hav ing aihubr providedwitltselecti'vefiz usable I boresof' different sizes so. that the" pulley can be adapted" to different size" drive shafts; which is efiective'to accurately center the selected bore" atthe'centeroft'he pullerandmaintain the-se lected bore, in centered'iposition which is accuratelybalazrced"regardless"of-the'boreselected forrusey which easy to" adjust to bring any seiectedfbore to centeredposition; and which issimple and durabie' in construction, economical to manufacture, andmaybe provided in" pulleys or" other" drive devices': of various forms and sizes.

Qthertobiects"amtadfrantages will becomeap-" parent from" a consideration" of the" followingdescription'; andtli'e' appendedclaims "in conjuno tl'omwitiithe accompanying drawings; where im" Figure 1 is'an? end'eievationa'l viewof a drive device illustrative of?" the: invention;

Figure 2 is a" side elevational view of the drive device illustrated in Figure 1;,

Figure 4"is a cross=sectiona1view"on the line Figure 5 is a perspectiveview'of a cylindrical hub'" constitutingan operative component of thefdriverdevi'ceullustrated iii-Figures 1 to'4" in= elusive;

Figure 6" is "a side eievationafviewmff a" some what *modifiedform of drive device:

Figure 7is'a'cross sectional'viewpn the line 1-1 of Figure 6;,

Figure 8is afrontielevational view of the drive device illustrated in Figures 6i'arid7 Figure 9*isafront"elevational view offa still ffirther modified. form ofdriver device;

Figure" 10"" is a sidior. edge elvati'onafview of*the.drivedevice illustratedlin'Fi'gure 9', and? Figure" 11 is" a crossvsectlonalview on n the line Ii -Ii of Figure 9'.

With'continuedreference to the drawingsiand particularly to Figures no 5. inclusive, the first form' of the invention; comprises a. circular; belt I pulley I O'jhavihg, spaced apart peripheral iflanges. I I andI 2.providing, tlierebetween, a belt igroove I3" of generallir V.-shap eo'l" cross section This pulley has .on onesidetliereofi'a cylind-ricalextension l4coaxial withthe pulley andla circular.

opening I 5'. extends. through the pulley and Ithe extension ll'with its axis spaced from. andjsubstantial-ly parallel to .th'eiiaxis of: the pulley. I The diameterofthe' opening I5"extends' from one 19 "respectively;

side' ofthe pulley "past" thepully axis-andacyiifi dri'cal" hub" I 6* is mounted in thewpening y lfi ffn'" rotation aboututs' own" axis: This" hub- It has a" length" substantially equal to the combined thicknessof .tliepulley" I D and extensihn andi hasits endsfiush with-the op riosite'iaee softlie pulley and the cylindi-ical extension:

The hub is" is provided with three bores HE I8 and I9 extending" therethrough" and" having their axesspaced apart at substantially equal" angular intervals and spaced outwardly" from and parallel to the axis of the hub. The axes=of the bores-"I 1; I 8and- I 9 '1ie in acii'cl'e'wliiclipasses through theaxis" of the-pulley so thatany Oneits axis ,is coincidentwith the pulley axis; 'I'fiese bores l1; IB-"an'd'IQ-are ofrelaztively'clifierentsi'iies= and maybe dimensioned to "receive the' -standard motor shaft of one-half, five-eighths and th'r'ee' fourthsinchdiameter;

The-huh I6 is provided-witli-tapped lioles'flfi 2| and 22 extending 'chordivisetherethrougl'iintermediate the length-thereofwitlf theincenter lines intersecting the axes-"of the bores" H; Iiiand The 'pulley' extension llis -pro vid'ed" with" a tapped" hole 23" extending" diamet rically therethrough with its center line inter secting the axis of the pulley.

These tapped ho'les'are-allpreferablyoppositely: threaded in" their respectively" opposite emit and setscrews 2'4and-25preferably ofthe kllm head type are threaded one-into eachend oFthc' hole-'23.

When the set screws 24 and ZSare-ijack'ed out away from the hub I 6*; the hub cambe turned in the opening I 5" 'to bring; any selectedone-'-of'-tlie b'oresfi'l, I8-"or I9-into centered position with-it's'-' axis coincident with the pulley axiswhereupon the set screws may be threaded into the 1 corre--' spondingtapped hole-20i 2I-or-22"inthe hub to firmly lock-the hub in *positionin the pullywitlt" the selected-boreproperly centered in the pulley:

Each of the-bores is provided at oneside'with a keywa-y, as indicated at'ZS? 2! and'28-for the respectively and" a Key 29* receivedun the keyway'o'f the selected bore engages in-a key, slot-provided in diameter shaft 3B"to"'providei a driving connection' between" the? motor shaft and" the pulley;

Preferably the key slots in Ltheb'ores arecentered; on" theI-center-lines ofthe corresponding: tappedholes in the hub sothat; when the'pulley" isassemble'd on the motor shaft; the:1'111'1e1""errci ofone of the set screws will be'broughtto against" theouter side: of the key 29 to: assist'in securing the pulley on the shaft and the 'key'in.

operative position in the coresponding, keyway" and the key slot of the shaft:

An aperture '3 I is drilled, through the; h b w extending inan inclined"direction"frompne'face or end of the hub substantially to the periphery of the hub intermediate the length thereof for receiving a pin by means of which the hub is turned in the hub receiving opening in the pulley when it is desired to change the selection of bores for receiving the drive shaft.

At the side of the pulley axis opposite the major portion of the opening [5, the extension I4 is hollowed out, as indicated at 32, to provide a pocket, the volume of which is substantialy equal to the volume of two of the bores in the hub It so that the weight of the pulley will be accurately balanced around the axis of pulley rotation.

In the first form of the invention shown in Figures 1 to 5 inclusive, the pulley is materially larger than the hub l6 so that the hub receivin opening can be provided eccentrically in the pulley itself. As the diameter of the hub cannot be reduced below a predetermined minimum if the hub is to contain the desired number of bores of predetermined sizes, when it is desired to use this hub with a pulley having a diameter insufficient to receive the hub receiving opening in proper eccentric position therein, it becomes necessary to utilize a somewhat difierent construction, such as that illustrated in Figures 6, '1 and 8.

In this second form of the invention, the pulley is provided at one side of an extension 35 of somewhat elliptical shape, the major diameter of which is materially greater than the diameter of the pulley and the minor diameter of which is substantially the same as the diameter of the pulley.

The pulley 35 is tension 38 and one working surface of the pulley is provided by a beveled face 31 on the adjacent end of the extension. A cylindrical pulley bottom portion 38 extends from the beveled face 31 coaxially thereof and an outer flange 39 is carried by the cylindrical portion 38 at the end thereof remote from the face 31.

A cylindrical hub receiving opening is provided in one end of the extension 35 and the dimeter of this opening extends from this end of the extension past the pulley axis. The hub 15, described above, having the bores l1, l8 and I9 therein is rotatably mounted in the opening 40 and the extension 35 is provided with a tapped hole 4| extending diametrically therethrough, substantially at its mid-length location so that its center line intersects the pulley axis. The set screws 24 and 25 are threaded into the respectively opposite ends of the tapped hole 4| to lock the hub it in selected rotational positions in the extension 33 in the manner described above in connection with the first form of the invention.

The extension 36 is internally hollowed out in its end opposite the end receiving the opening 40 to provide a pocket 42 of substantially the same volume as the volume of two of the bores in the hub 16 so that the Weight of the extension 36 will be balanced around the axis of rotation of the pulley and the extension.

The third form of pulley, particularly illustrated in Figures 9, l0 and 11, is adapted for light loads and comprises a belt pulley 45 having fiat and substantially parallel end faces with no lateral extension thereon. This pulley has a circular periphery provided with spaced apart peripheral flanges 45 and 41 to provide therebetween a belt grooves 48 of generally V-shaped cross section and has a circular or cylindrical opening 49, a diameter of which extends from one side of the pulley past the pulley axis. A cylinformed at one side of the expositions in the pulley drical hub 50 corresponding in all respects to the hub 16 except that it has a length substantially the same as the thickness of the pulley 45 is mounted in the opening 49 with its ends substantially flush with the corresponding end faces of the pulley. This hub 50 is provided with three bores 51, 52 and 53 which may be of the same relative sizes as the bores l1, l8 and 19 in the hub l6 and are arranged in the same manner in the hub. These bores 5|, 52 and 53 may be provided with keyways or the keyways may be omitted if the pulley is designed for use as an idler pulley to rotate on a fixed shaft or axis.

The pulley 45 has a tapped hole 54 extending diametrically therethrough with its ends in the peripheral portion 55 of the pulley between the flanges 46 and 41 and its center line intersecting the axis of pulley rotation. This hole 54 receives the set screws 24 and 25 which are threaded at their inner ends into tapped holes, as indicated at 56 in Figure 11, extending chordwise of the hub 50 with their center lines respectively intersecting the axes of the bores 5|, 52 and 53. These set screws lock the hub 50 in selected rotational 55 in the manner explained above in connection with the first and second forms of the invention.

Opposite the opening 49 the pulley is provided. with a lightening hole or recess 51 so that the weight of the pulley and hub will be equally distributed around the axis of pulley rotation and the pulley will be in balance.

While the invention has been illustrated in combination with a V-belt pulley, it is to be understood that it may be combined with other forms of belt pulleys or with gears and other circular rotatable devices, such as abrasive wheels and sanding disks. Also, while the hub has been illustrated as having three bores of specified sizes, it is to be understood that the number of bores and the sizes of the bores may be varied with: out in any way exceeding the scope of the invention.

The invention may be embodied in other speific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are, therefore, intended to be embraced therein.

Having thus described the invention, what is claimed is:

1. A rotatable device comprising a body having an axis of rotation and having a circular opening therein with the axis of said opening spaced from and parallel to the axis of rotation of said body, a cylindrical hub rotatably mounted in said opening and having angularly spaced apart bores of different sizes extending therethrough, the axes of said bores being spaced from and parallel to the axis ofv said hub and spaced apart along a circle which passes through the axis of rotation of said body, and means connected between said body and said hub holding said hub in positions of rotation relative to said body with the axis of any selected bore coincident with the axis of rotation of said body.

2. A rotatable device comprising a body having an axis of rotation and having a circular opening therein with the axis of said opening spaced from and parallel to the axis of rotation of said body, a cylindrical hub rotatably mounted in said opening and having angularly spaced apart bores of different sizes extending therethrough, the axes of said bores being spaced from and parallel to the axis of said hub and lying in a circle which passes through the axis of rotation of said body, and means connected between said body and said hub holding said hub in positions of rotation relative to said body with the axis of any selected bore coincident with the axis of rotation of said body, said body having a lightening recess therein at the side of said axis of rotation remote from the major portion of said opening.

3. A rotatable device comprising a body having an axis of rotation and having a circular opening therein with the axis of said opening spaced from and parallel to the axis of rotation of said body, a cylindrical hub rotatably mounted in said opening with its axis spaced from and parallel to said axis of rotation and having angularly spaced apart bores of difierent sizes extending therethrough, the axes of said bores being spaced from and parallel to the axis of said hub and lying in a circle which is centered on the axis of said hub and passes the axis of rotation of said body, said hub having tapped holes extending chordwise therethrough intermediate its ends with their longitudinal center lines respectively intersecting the axes of said bores, said body having a tapped hole extending therethrough with its center line perpendicularly intersecting said axis of rotation, and set screws threaded into the tapped holes in said body and threadable into the tapped holes in said hub to hold said hub in positions relative to said body with the axis of any selected bore coincident with the axis of rotation of said body.

4. A multiple bore pulley assembly comprising a circular pulley having an axis of rotation and at least one end face substantially perpendicular to said axis of rotation, a cylindrical hub carried by said pulley and having an axis of rotation relative to said pulley spaced from and parallel to the axis of rotation of said pulley, said hub having angularly spaced apart bores of different sizes extending therethrough with their axes spaced from and parallel to the axis of rotation of said hub and lying in a cylindrical surface coaxial with the axis of rotation of said hub and including the axis of rotation of said pulley whereby the axis of any selected bore can be brought into coincidence with the axis of rotation of said pulley by rotating said hub relative to said pulley, and means acting between said pulley and said hub to releasably secure said hub in selected rotational positions relative to said pulley.

5. A multiple bore pulley assembly comprising a circular pulley having an axis of rotation and having a coaxial extension on one side thereof, said pulley and said extension having a circular opening extending therethrough with its axis spaced from and parallel to the axis of rotation of said pulley, a cylindrical hub disposed in said opening and having an axis of rotation 01' said hub relative to said pulley spaced from and parallel to the axis of rotation of said pulley, said hub having angularly spaced apart bores of different sizes extending therethrough with their axes spaced from and parallel to the axis of rotation of said hub and lying substantially in a cylindrical surface coaxial with the axis of rotation of said hub and including the axis of rotation of said pulley whereby the axis of any selected bore can be brought into coincidence with the axis of rotation of said pulley by rotating said hub relative to said pulley, and means acting between said pulley and said hub to releasably secure said hub in selected rotational positions relative to said pulley, said extension having a lightening recess therein at the side of the axis of rotation of said pulley remote from the axis of notation of said hub.

6. A multiple bore pulley assembly comprising a circular pulley having an axis of rotation and having an extension of generally elliptical shape on one side thereof substantially coaxial with said axis of rotation, said extension having a circular opening therein adjacent one end thereof, a cylindrical hub disposed in said opening and having an axis of rotation of said hub relative to saidpulley spaced from and parallel to the axis of rotation of said pulley, said hub having angularly spaced apart bores of different sizes extending therethrough with their axes spaced from and parallel to the axis of rotation of said hub and lying substantially in a cylindrical surface coaxial with the axis of rotation of said hub and including the axis of rotation of said pulley whereby the axis of any selected bore can be brought into coincidence with the axis of rotation of said pulley by rotating said hub relative to said pulley, and means acting between said pulley and said hub releasably securing said hub in selected rotational positions relative to said pulley, said extension having in the other end thereof a lightening recess for balancing the weight of said pulley, said extension and said hub about the axis of rotation of said pulley.

7. A multiple bore pulley assembly comprising a circular pulley having an axis of rotation and parallel end faces disposed substantially perpendicular to said axis of rotation, said pulley having a circular opening therein, the axis of which is spaced from and substantially parallel to the axis of rotation of said pulley. a cylindrical hub disposed in said opening and having end faces substantially flush with the and faces of said pulley, said hub having an axis of rotation of the hub relative to the pulley spaced from and parallel to the axis of rotation of said pulley and having angularly spaced apart bores of different sizes extending therethrough with their axes spaced from and parallel to the axis of rotation of said hub and lying substantially in a cylindrical surface coaxial with the axis of rotation of said hub and including the axis of rotation of said pulley whereby the axis of any selected bore can be brought into coincidence with the axis of rotation of said pulley by rotating said hub in said opening relative to said pulley, and means releasably connecting said hub to said pulley to hold said hub in selected rotational positions relative to said pulley.

RONALD A. JOELSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,507,093 Collings May 9, 1950 FOREIGN PATENTS Number Country Date 124,918 Great Britain Apr. '10, 1919 194,486 Germany Jan. 20. 1908 

